/*
* Conditions Of Use 
* 
* This software was developed by employees of the National Institute of
* Standards and Technology (NIST), an agency of the Federal Government.
* Pursuant to title 15 Untied States Code Section 105, works of NIST
* employees are not subject to copyright protection in the United States
* and are considered to be in the public domain.  As a result, a formal
* license is not needed to use the software.
* 
* This software is provided by NIST as a service and is expressly
* provided "AS IS."  NIST MAKES NO WARRANTY OF ANY KIND, EXPRESS, IMPLIED
* OR STATUTORY, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTY OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, NON-INFRINGEMENT
* AND DATA ACCURACY.  NIST does not warrant or make any representations
* regarding the use of the software or the results thereof, including but
* not limited to the correctness, accuracy, reliability or usefulness of
* the software.
* 
* Permission to use this software is contingent upon your acceptance
* of the terms of this agreement.
* 
*/
/*******************************************************************************
* Product of NIST/ITL Advanced Networking Technologies Division (ANTD)         *
*******************************************************************************/
package gov.nist.javax.sip.header;

import java.text.ParseException;

import gov.nist.javax.sip.address.*;
import javax.sip.address.*;

/**
 * AlertInfo SIP Header.
 *
 * @author M. Ranganathan   <br/>
 * 
 * @since 1.1
 * 
 * @version 1.2 $Revision: 1.7 $ $Date: 2007/10/18 17:48:08 $
 *
 * 
 */
public final class AlertInfo
	extends ParametersHeader
	implements javax.sip.header.AlertInfoHeader {

	/**
	 * Comment for <code>serialVersionUID</code>
	 */
	private static final long serialVersionUID = 4159657362051508719L;
	/** URI field
	 */
	protected GenericURI uri;
	/** String field
	 */
	protected String string;

	/** Constructor
	 */
	public AlertInfo() {
		super(NAME);
	}

	/**
	 * Return value encoding in canonical form.
	 * @return The value of the header in canonical encoding.
	 */
	protected String encodeBody() {
		StringBuffer encoding = new StringBuffer();
		if (uri != null) {
			encoding.append(LESS_THAN).append(uri.encode()).append(GREATER_THAN);
		} else if (string != null) {
			encoding.append(string);
		}
		if (!parameters.isEmpty()) {
			encoding.append(SEMICOLON).append(parameters.encode());
		}
		return encoding.toString();
	}

	/**
	 * Set the uri member
	 * @param uri URI to set
	 */
	public void setAlertInfo(URI uri) {
		this.uri = (GenericURI) uri;
	}

	/**
	 * Set the string member
	 * @param string String to set
	 */
	public void setAlertInfo(String string) {
		this.string = string;
	}
	
	/**
	 * Returns the AlertInfo value of this AlertInfoHeader.
	 * @return the URI representing the AlertInfo.
	 */
	public URI getAlertInfo() {
		URI alertInfoUri = null;
		
		if (this.uri != null) {
			alertInfoUri = (URI) this.uri;
		} else {
			try {
				alertInfoUri = (URI) new GenericURI(string);
			} catch (ParseException e) {
				;  // Eat the exception.
			}
		}
		
		return alertInfoUri;
	}

	public Object clone() {
		AlertInfo retval = (AlertInfo) super.clone();
		if (this.uri != null) {
			retval.uri = (GenericURI) this.uri.clone();
		} else if (this.string != null) {
			retval.string = this.string;
		}
		return retval;
	}
}
